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Politics : Formerly About Advanced Micro Devices
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To: Steve Porter who wrote (61545)6/11/1999 11:52:00 PM
From: Tenchusatsu  Read Replies (1) of 1575512
 
<3dnow doesn't need mroe registers, because it has enough, with teh physical registers being remapped seemlessly between the FPU and the 3d-now/mmx units>

And that gives you eight 64-bit registers that have to share space with one another, i.e. more load-stores between registers and L1 cache. SSE, on the other hand, provides eight additional 128-bit registers, and AltiVec (for PowerPC) provides 32 additional 128-bit registers. The result is fewer load-stores between the registers and the L1 cache. Another advantage is more efficient cache-streaming thanks to the greater number of registers.

I'll try and hold back additional comments until I have a chance to read what Microprocessor Report has to say about the "enhanced 3DNow!"

Tenchusatsu
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